Category: Apple Xcode

Assumption:
I assume you have deployed UITabBarViewController in your iOS App. Now you want to change the Tint color of the UITabBar, the Tint color of the UITabBar item, and the tint color of the UITabBar’s unselected icon.

Doing this is just as simple as a single line of code.

The code below will go to your Apple iOS app’s AppDelegate.swift file under the ‘didFinishLaunchingWithOptions’ function.

So your code will look something like this.

Assumptions:
I assume you have already embedded in UITabBarViewController for your ViewController in Interface Builder. You also have three tab bar items with individual view controllers and created image assets with your icons.

Copy the following code using your current View Controller’s ViewdidLoad method.

Let’s assume you use Tab Bar View Controller in your Xcode Project.

You have embedded in your view controller with UITabBarViewController.

Say you are using 3 Tab Views.

In Swift programming Language, number counting starts with 0, so you will write code like this in your respective view controller’s viewDidLoad function.

While we use app development methodologies like MVC (Model, View, Controller), we encounter problems navigating from one view to another. How do you change the text of the back button, which gets populated automatically by the Apple iOS operating system?

You can use the below method in the viewDidLoad method of your root view:

navigationItem.backBarButtonItem = UIBarButtonItem(title: "Back", style: .plain, target: nil, action: nil)

Here is another way of doing the same, which can be done in the ‘prepare for segue’ method of your app:

Here is the situation in your Xcode project where you want to call a method from another class Swift file to your original class of Swift file.

Let’s call your original swift class file ‘FirstViewController’, which has ‘UIViewController’ as a superclass.

The second swift that you want to call a function from, we will assume that it has ‘SecondViewController’ as the class name & it has ‘UIViewController’ as a superclass.

You have written a function called ‘print something()’ in your ‘SecondViewController’ that would be triggered when somebody taps on the button present on ‘FirstViewController’ as IBAction called ‘print this(sender: UIButton)’

So, you will write a print function as follows:

The Xcode error called ‘Frame for “Text View” will be different at run time.’ is frequent when you are trying to utilise Auto Layout by using reset to suggested constraints in Xcode Storyboard.

So here is how to fix it:

Step 01:
Above Debug: In your Xcode Storyboard view screen, you will have four buttons at the extreme right. Use the pin button, third from right, to add new constraints per item at the top, right, bottom, and left, and uncheck the constraint to margins.

There are instances when you want to transition or navigate from one UI screen to another by pressing a button.

Yes, you can link the button visually by control-clicking on it and then linking it to the required UI Screen on the storyboard.

But I will show you how you can do it programmatically with code defined & working differently for iPad & iPhone Storyboards.

I have used iOS Conditional coding syntax to differentiate iPhone & iPad Storyboards

Note: You can read about iOS Conditional Coding Here, How to detect user is using iPad or iPhone for iOS App at run time conditional coding purposes

You want to hide this ‘Back’ button when you transition from one screen to the next, probably the detail view screen, where Xcode automatically puts this for you without asking if you want it.

You can copy the below code to your ‘viewDidLoad’ method in your respective file:

Objective-C Code:

[self.navigationItem setHidesBackButton:YES animated: YES];

Swift Code:

self.navigationItem.setHidesBackButton(true, animated: true);

Hope it helps,

Thanks & Regards
Mandar Apte